Implement a bluetooth picker dialog for Android

content/public/browser/bluetooth_chooser.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_BLUETOOTH_CHOOSER_H_
 #define CONTENT_PUBLIC_BROWSER_BLUETOOTH_CHOOSER_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 // Represents a way to ask the user to select a Bluetooth device from a list of
 // options.
 class CONTENT_EXPORT BluetoothChooser {
  public:
   enum class Event {
     // The user cancelled the chooser instead of selecting a device.
     CANCELLED,
     // The user selected device |opt_device_id|.
     SELECTED,
+    // The user asked for a new Bluetooth discovery session to start.
+    RESCAN,
 
     // As the dialog implementations grow more user-visible buttons and knobs,
     // we'll add enumerators here to support them.
   };
 
   // Chooser implementations are constructed with an |EventHandler| and report
   // user interaction with the chooser through it. |opt_device_id| is an empty
   // string except for Event::SELECTED.
   //
   // The EventHandler won't be called after the chooser object is destroyed.
@@ skipping 22 matching lines @@
                          const base::string16& device_name) {}
 
   // Tells the chooser that a device is no longer available. The chooser should
   // not call DeviceSelected() for a device that's been removed.
   virtual void RemoveDevice(const std::string& device_id) {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BLUETOOTH_CHOOSER_H_